Fuse-plug.



E. D. KNOTT.

FUSE PLUG.

APPLlCATlQN FILED DEC-9.1916. 1,238,690. Patented Aug. 28, 1917.

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W aim/W EDWARD DOWNMAN KNOTT, OF NEW ORLEANS, LOUISIANA.

FUSE-PLUG.

Specification of Letters Patent.

Patented Aug. 28, 1917.

Application filed December 9, 1916. Serial No. 136,031

T 0 all whom it may concern Be it known that I, EDWARD DOWNMAN KNOTT, a citizen of the United States, residing at New Orleans, in the parish of Orleans and State of Louisiana, have invented certain new and useful Improvements in F use-Plugs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to improvements in fuse plugs, and has for its primary object to improve generally the construc tion of devices of this character.

Another object of my invention lies in providing such devices not only with the projecting plug for removably fitting an electric appliance, but also in equipping the device with a socket, between which latter and the plug are connected one or more fuses, and which is adapted to receive a lamp or a plug of an electric coupling or other appliance.

It is a further object of my invention to provide an improved fuse plug in which the parts will be few and assembled in compact arrangement, where they are fastened together in a simple manner and form an exceedingly strong and durable structure. V

With these and other objects in view the invention consists in the novel details of construction and combinations of parts more fully hereinafter disclosed and particularly pointed out in the claim.

In the accompanying drawings forming a part of this application, and in which similar reference symbols indicate corresponding parts in the several views:

Figure 1 is a view in elevation of my improved fuse plug shown attached to an electric fixture and carrying a double plug socket.

Fig. 2 is an enlarged elevational view of the improved plug with the cover moved to register with the fuse recesses.

Fig. 3 is a longitudinal sectional view of the improved device.

Fig. 4 is a transverse sectional view taken on the line 4.-4 in Fig. 2.

Fig. 5 is a cross sectional view through the device on the line 5-5 in Fig. 2; and

Fig. 6 is a perspective VlBW of one of the preferred forms of electric fuses employed.

Referring more particularly to the drawings, 1 in Fig. 1 designates an electric ap.-

pliance, such as a lamp socket, to which my improved fuse is connected, and which in turn carries the electric lamp 2.

For a detailed description of the improved fuse plug reference is had more particularly to Figs. 2 to 5 inclusive; and in these views 3 designates a bod constructed of porcelain or some other insulation material, preferably of a general exterior cylindrical contour, and having at one end a recess 4 for receiving the reduced end 5 of a plug 6.

This plug 6 has the usual central terminal 7 and the usual screw ring terminal 8, by means of which it is received into the fixture 1.

The opposite end of the body 8 is formed with a socket 9 in which is placed a screw ring terminal 10 and a central terminal 11, insulated from the terminal 10 by the usual mica or other disks 12, and carried on a central rod 13. The terminals 7 and 8 of the, plug 6 and the corresponding terminals 10 and 11 of the socket 9, are connected together by fuses in the manner which will be now explained.

In the body 3 are formed recesses 14 and 15 which are preferably diametrically disposed and located to opposite sides of a central longitudinally extending web 16. At

the opposite ends of the web 16 are openings 17 and 18, and into these openings project the inner ends, respectively, of the terminal 7 of the plug 6 and the rod 13 which carries the central terminal 11 of the socket 9. (See Fig. Plates 19 and 20 are screwed on or otherwise connected to the rods 7 and 13, and project in opposite directions into the recesses 14 and 15 where they receive spring clips 21 and 22. These spring clips are screwed or riveted to the projecting ends of the plates19 and 20, or may be connected thereto in any suitable manner.

The other terminals, 8 of the plug 6 and 10 of the socket 9, are in electrical connection with U-shaped bars 23 and 24, respectively, which extend down within the body 3 and into the recesses 15 and 14, they car rying spring clips 25 and 26. These clips may likewise be fastened to the bars 23 and 24 in any suitable manner, preferably such as will not interfere with the free passage of the current. Between the spring clips 22 and 25 there is removably fitted any suitable fuse which occupies the recess 15 in the body 3; while between the clips 21 and 26.

is similarly removably fitted a second fuse of any description, which extends through the recess 14.

These fuses are preferably of the construction shown to advantage in Fig. 6, where 27 designates a strip of insulation and fireproof material having its opposite ends wrapped with metal pieces 28 and 29 which form terminals for the fuse, and which are of a character to be readily received in and withdrawn from the spring clips. Between the metal pieces 28 and 29 a fusible conductor 30 is stretched, extending longitudinally and preferably centrally of the strip 27, it beingconnected to the pieces 23 and 29 in any preferred manner, as indicated at 31 and 32.

The manner of inserting these fuses will be readily understood by those skilled in this art from an inspection of Figs. 2, 3 and 4 of the draw ngs, which show that the metal pieces 23 and 29 are received in the respective clips 22, 25, and 21, 26, the fuses eX-v tending through the recesses 14 and 15 and being withdrawable therefrom by an outward radial movement.

A cylindrical sleeve 33 is fitted over the body 3, and has a rotary movement thereabout for the purpose of opening and closing the recesses 14 and 15. There are openings 34 and 35in the sleeve 33 which are adapted, and are of a size, to register with the recesses 14 and 15 when said sleeve is turned to the position shown in Fig. 41. When in this position the openings 34 and 35 give access tothe recesses 14 and 15, and the fuses therein may be thus readily I withdrawn when burnt out and fresh fuses substituted. After the substitution has been made the cover 33 is revolved to the position shown in Fig. 1, where the openings. 34. and 35 are moved out of registry with the recesses'14. and 15, and the imperforate walls of said sleeve 33 are brought opposite said recesses, thus forming an effective closure therefor, preventing the entrance of dust, dirt, or other foreign matter, and shielding surrounding objects from the effect of the blowing of a fuse. This rotary movement of the sleeve or cover 33 is preferably limited, and for this purpose a slot 36 is produced in the exterior wall of the body 3,

as shown in Fig. 5, into which slot projects a pin 37 carried on the sleeve 33, and which abuts against the opposite end walls of said slot 36 in a manner to prevent the sleeve from further rotation when moved to either open or close the recesses 14 and 15.

The use of the invention illustrated in Fig. 1 will suggest numerous uses in this art to those skilled therein, While the construction and operation are clear from the foregoing description taken in connection with the accompanying drawings.

It is obvious that those skilled in the art may vary the details of construction and arrangements of parts without departing from the spirit of my invention, and therefore I do not wish. to be limited to such features except as may be required by the claim.

I claim:

A device as described including av body having recesses therein, a web separating said recesses and having openings at opposite ends thereof, a plug carried on said body, a central terminal for said plug extending into one of the openings in said web, a spring clip fitted in one end of one of said recesses and being connected to said central plug terminal, a ring terminal for said plug, a spring clip fitted in one end of the other recess and in connection with said ring terminal, a socket carried on said body and having a central terminal projecting at one end 1nto the opposite opening in said web, a spring clip fitted in the opposite end of the second-named recess and being connected to said central socket terminal, a ring terminal for said socket, a spring clip fitted in the opposite end of the first-named recess 'fusible conductors attached to said pieces and lying against said strips, substantially as described.

In testimony whereof, I affix my signature.

EDWARD DOWNMAN KNOTT. 

